Supertone Supertonic TTS
On-device English text-to-speech that runs entirely in the app, with ten preset voices and no API key.
Supertonic TTS is an open-weight text-to-speech model from Supertone. It converts written text into natural, spoken audio. It runs entirely on your own hardware through Hugging Face: no API key and no per-use fees.
- Released
- Nov 2025
- Pricing
- Free, runs on your hardware
- Type
- Text-to-speech
Samples
Generated with Supertonic TTS via Hugging Face: the same three scripts read by every text-to-speech model in the catalog, so the only thing that changes between two models’ clips is the model. Each model uses its own default voice; there is no shared voice to hold constant.
Baseline naturalness and pacing
The last train had already left, but she decided to walk anyway. The city was quieter than she remembered, and for the first time in weeks, she wasn't in a hurry.
Emotion, emphasis, and pauses
Wait — you're telling me it actually worked? After all that? I can't believe it. Honestly, I thought we'd lost the whole thing.
Decimals, percentages, version numbers
The API returned 3,481 results in 0.42 seconds, a 12 percent improvement over version 2.5. Latency at the 99th percentile dropped from 840 milliseconds to 610.
Supertone
Supertone is a Seoul voice-AI company whose Supertonic text-to-speech models are exported to ONNX and built to run entirely on the user's own device.
supertone.ai ↗